William mahler



UNITED STATES PATENT OFFICE.

WILLIAM MAHLER, OF NEW YORK, N. Y.

lNCANDESCENT-LIGHTING SUBSTANCE.

SPECIFICATION forming part of Letters Patent N 0. 588,685, dated August 24, 1897. Application filed July 10, 1897. Serial No. 644,155. (No specimens.)

To all whom it may concern.-

Be it known that 1, WILLIAM MAHLER, a citizen of Austria, residing at New York, in the county and State of New York, have invented a new and useful Improvement in Incandescent-Lighting Substances, of which the following is a specification.

My invention relates to improvements in the manufacture of incandescent-lighting devices such as are used for the well-known incandescent gas-light, in which is used a hood, frame, or mantle made up, primarily, of a fabric of cotton threads or the like and impregnated with a solution of the salts of in fusible earthy oxids. This prepared fabric is then subjected to heat, which consumes the foundation or primary fabric and leaves a skeleton body consisting of the infusible earthy oxids resulting from the decomposition of the salts employed in impregnating the fabric.

My invention consists in an improved compound for impregnating the hood, frame, or mantle before described; and-the object of my invention is to strengthen the mantle and increase the durability thereof, increase the illuminating power, and cause the mantle to maintain its shape.

In carrying out my invention I attain these objects by the use, first of all, of a very large percentage of thorium oxid and to this add a very small percentage of cerium oxid and a percentage of lanthanum oXid equal to about one-half of the cerium oxid; The proportions I find effective and to give the best results are about 98.5 per cent. of thorium oxid, one per cent. of cerium oxid, and .5 per cent. of lanthanum oxid, but I do not, of course, wish to be limited to these exact proportions.

The combination of thorium oxid and cerium oxid is old in the art, but I have discovered that the-addition of a percentage of lanthanum oxid equal to about one-half that of the cerium oxid results in a compound which will produce a mantle of high illuminating power emittinga brilliant yellow light. It will also produce a mantle which is elastic, and hence very much more durable and less brittle than heretofore, and one that will not shrink or become distorted, but which will retain its original shape.

1. A mantle or hood for incandescent lighting composed of a large percentage of thorium oxid, a small percentage of cerium oxid and a smaller percentage of lanthanum oxid, substantially as specified.

2. A mantle or hood for incandescent lighting, composed of about ninety-eight and onehalf per cent. (98%%) of thorium oxid, about one per cent. (1%) of cerium oxid and about one-half of one per cent. of 1%) of lanthanum oxid, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM MAHLER. 

